>> reporter: the golden gate bridge has 6 lanes of traffic. the number of lanes travelling in each direction on the bridge changes throughout the day 1 1 on the southern end of the bridge, there are 11 eleven toll lanes. only cars traveling south into san francisco have to pay tolls...northbound travel is free. google earth currently, at the toll plaza, the southbound lanes on the left are fastrak only, the rest accept fastrak or cash, via toll takers. the number of each type of toll lane varies depending on how the bridge lanes are configured. but after the conversion to all electronic tolling take place in possibly late march, all of the toll lanes will function in the same way. every lane will become an electronic toll lane and there will no longer be toll takers accepting cash. fastrak will continue to work at all of the lanes and for drivers who don't have a fastrak account, cameras will record license plate numbers and send a bill to the car's registered owner. commuters will also be able to set up an account based on their license plate number, where every time they drive through the plaza a charge will be sent to their credit card.